Using linear approximations seems to work decently to calculate location using a distributed architecture. AKA using cellphones to geolocate each other rather than triangulate strictly from basestations, and using it like a graph node network so your tracking ability can reach like a tentacle into buildings and closed spaces, assuming nobody is feeding fake info...

Ha, now Mozilla gets in the act and releases a custom extension to completely contain facebook interactions. Which will only work if you first completely nuke firefox to erase all traces/cookies/ID's/ad beacons first, before reinstalling. Will probably still leak data if you use a facebook logon elsewhere though. I suppose if you want to do something and your OPSEC game isn't on, this will have to do.

Vaultcard seems to be a RFID transponder based jammer to protect nearby contactless cards. They seem to suggest the jamming is commensurate to reader power (to defend against high power reader attacks), but it isn't a dumb retroreflector.

So this is the intermediate solution to Cloudflare CAPTCHA's disturbing every connect via Tor. You get 30 tokens for one CAPTCHA, which you burn for subsequent passes through Cloudflare until you run out.

Uses the selfie camera as an active gaze tracker to obscure areas of the screen outside your direct line of sight. Some windows privacy screen apps do similar, but obfuscating with gibberish rather than darkening. But this seems locked to Blackberry android phones...

Eyewear with retroreflective tape, reflecting visible/IR light. I suppose one could say this is anti-surveillance/anti-paparazzi gear. But, while they may not get your face, you stick out like a sore thumb on IR CCTV surveillance footage at night.